import java.util.Scanner;


public class Main_yukicoder76 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        double[] e = {0.0, 1.0000000000000000, 1.0833333333333333, 1.2569444444444444, 1.5353009259259260, 1.6915991512345676, 2.0513639724794235};
        double[] p = new double[6 + 1];
        p[6] = 1.0;
        for (int i = 1; i <= 5; i++) {
        	double tmp = 1;
        	for (int j = 1; j < i; j++) {
        		tmp += p[j] * e[i + 1 - j];
        	}
        	p[i] = (e[i + 1] - tmp) / e[1];
        	p[6] -= p[i];
        }

    	e = new double[1000000 + 1];
        for (int i = 1; i <= 1000000; i++) {
        	double tmp = 1.0;
        	for (int j = 1; j <= 6; j++) {
        		if (i - j > 0) {
        			tmp += e[i - j] * p[j];
        		}
        	}
        	e[i] = tmp;
        }

        int t = sc.nextInt();
        for (int i = 0; i < t; i++) {
        	System.out.printf("%.6f\n", e[sc.nextInt()]);
        }

        sc.close();
    }
}